Techno‐economic study of compressed air energy storage systems for the grid integration of wind power

Integrating variable renewable energy from wind farms into power grids presents challenges for system operation, control, and stability due to the intermittent nature of wind power. One of the most promising solutions is the use of compressed air energy storage (CAES). The main purpose of this paper is to examine the technical and economic potential for use of CAES systems in the grid integration. To carry out this study, 2 CAES plant configurations: adiabatic CAES (A‐CAES) and diabatic CAES (D‐CAES) were modelled and simulated by using the process simulation software ECLIPSE. The nominal compression and power generation of both systems were given at 100 and 140 MWe, respectively. Technical results showed that the overall energy efficiency of the A‐CAES was 65.6%, considerably better than that of the D‐CAES at 54.2%. However, it could be seen in the economic analysis that the breakeven electricity selling price (BESP) of the A‐CAES system was much higher than that of the D‐CAES system at €144/MWh and €91/MWh, respectively. In order to compete with large‐scale fossil fuel power plants, we found that a CO₂ taxation scheme (with an assumed CO₂‐tax of €20/tonne) improved the economic performance of both CAES systems significantly. This advantage is maximised if the CAES systems use low carbon electricity during its compression cycle, either through access to special tariffs at times of low carbon intensity on the grid, or by direct coupling to a clean energy source, for example a 100‐MW class wind farm.     

The development of natural gas and hydrogen pipeline capital cost estimating equations

Natural gas pipeline cost data collected by the Oil and Gas Journal (O&GJ) [1] for interstate pipelines constructed from 1980 through 2017 were used to develop capital cost estimating equations that are a function of pipeline diameter, length, and U.S. region. Equations were developed for material, labor, miscellaneous, and right-of-way costs, the four cost components in the O&GJ data, for six different regions of the United States (U.S.). Each equation is a function of pipeline diameter and length.Adjustment mechanisms were then developed for converting the natural gas pipeline equations into equations for estimating the costs of hydrogen pipelines. These adjustments were based in part on an analysis completed by the National Institute for Standards and Technology (NIST) [2,3]. The results of this work were used to update cost models in the Hydrogen Delivery Scenario Analysis Model (HDSAM) [4], developed by Argonne National Laboratory for the U.S. Department of Energy's Hydrogen Program. Our analysis shows a wide range of pipeline cost across different U.S. regions, especially with respect to labor and right-of-way costs. The developed cost formulas for hydrogen pipelines are both important and timely as hydrogen is being considered as a zero-carbon energy carrier with the potential to decarbonize all energy sectors, and the cost of hydrogen transportation is essential for techno-economic analysis of its potential use in these sectors.     

论新时代饲料工程项目设计建设的原则

饲料工程项目设计与建设的质量对饲料生产线建成后的生产质量、效率、能耗、成本、生产安全、环境等都会造成长期影响.因而,饲料工程项目的设计、建设中必须坚持正确的设计与建设原则.在以往的饲料工厂设计文献包括教材、设计手册、专业书籍等中,介绍的设计原则主要是技术上可行,经济上合理、节约用地.当前,我国饲料工业已进入创新驱动、绿...     

The impact of social capital on mass customisation and product innovation capabilities

Social capital with customers has three dimensions: structural, relational and cognitive capital. We propose a research model on the joint effects of the three dimensions of social capital on mass customisation capability (MCC) and product innovation capability (PIC). The hypotheses are empirically tested using structural equation modelling and data collected from 276 manufacturing firms in China. The results show that the three dimensions of social capital contribute to MCC and PIC development through different mechanisms. In particular, cognitive capital has a significant impact on MCC; relational capital significantly influences PIC; and structural capital indirectly associates with both MCC and PIC. We also find that structural capital enhances both relational and cognitive capital. MCC improves PIC and fully mediates cognitive capital’s effect on PIC. The findings extend current understanding about the complex interrelationships among structural, relational and cognitive capital and how to develop MCC and PIC by investing in social capital.     

结合权衡理论的最小负债成本模型的研究

对权衡理论作了简要的介绍分析,并在资本资产定价模型的基础上,结合权衡理论的数学模型,提出了间接计量破产成本和代理成本的原理,建立了结合权衡理论的最小负债成本模型．     

关于对我国民间信用体系建设中有关问题的思考

我国目前的民间资金存量非常大，仅居民存款已经超过12万亿元；另一方面，一些民营中小企业在创业过程中非常缺少发展资金却拿不到银行的贷款。可见，民间资本对我国中小企业融资有着重要意义。而我国目前存在的民间信用缺失现象不但破坏了国家金融秩序，还引发了很多社会问题。因此怎样建立民间信用体系，控制民间信用风险，将是我们进行社会主义经济建设面临的一项重大任务。     

浅谈设计—施工项目总承包全过程投资控制

通过总结我国一批具有设计、采购、施工一体化的智力密集型工程总承包企业在全过程投资控制中的经验,结合作者自身的实践工作,为设计院转制的总承包公司在项目总承包管理过程中的工程投资(造价)控制献言献策,希望项目总承包模式能够为加快城市基础设施建设作出一定的贡献。     

油田伴生气生产甲醇技术方案介绍（一）

通过综合利用江汉油田伴生产气生产甲醇技术方案的阐述,切合实际地论证了方案选择,生产规模,工艺流程,物料和热量衡算,设备选型,以及全厂技术经济指标等方方面面。     

建设项目偿还借款的最优化模型与应用

结合运筹学与技术经济学 ,提出了还本付息的最优化模型。目的是解决如何还本付息可以使项目的资金运作效益更高     

论企业的营运资金管理

分析当前企业普普遍临的资金短缺现象的形成原因,并提出相应的解决办法。对企业财务和经营管理具有较高的参考价值。